CN101661359A - Capacitance type touch detection system and detection signal-receiving and waveform-shaping module thereof - Google Patents
Capacitance type touch detection system and detection signal-receiving and waveform-shaping module thereof Download PDFInfo
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Abstract
The invention discloses a capacitance type touch detection system, comprising a capacitance type touch panel and a detection control circuit. The capacitance type touch panel comprises a plurality ofinput ends and a plurality of output ends; the detection control circuit comprises a scan signal transmitting module which is eclectically coupled to the input ends to provide a scan voltage signal tothe input ends and a detection signal-receiving and waveform-shaping module which is eclectically coupled to the output ends to receive and process a plurality of detection signals outputted by the output ends so as to generated a plurality of processed detection signals. The detection signal-receiving and waveform-shaping module comprises a receiver and a RC impedance matching network, the receiver receives the detection signals, the RC impedance matching network shapes the waveform of the detection signals to compensate the affect caused by uneven RC distribution on the capacitance type touch panel so as to obtain the processed detection signals, therefore, the invention is greatly good for judging the analog-digital level in a detection control circuit.
Description
Technical field
The present invention relates to a kind of touch control detection technical field, relate in particular to a kind of capacitance type touch detection system and detection signal thereof and receive and waveform-shaping module.
Background technology
Referring to Fig. 1, it illustrates the structured flowchart of a kind of capacitance type touch detection system in the prior art.As shown in Figure 1, capacitance type touch detection system 20 comprises detection control circuit 22 and capacitance type touch-control panel 24.Wherein, detect control circuit 22 and comprise digitial controller 220, transmitter (Transmitter) 221, potential transferring devices 222, receiver (Receiver) 224, charging circuit 225, voltage amplifier 226 and analog/digital converter 228, transmitter 221, receiver 224, charging circuit 225 and analog/digital converter 228 are accepted the control of digitial controller 220.
Please in the lump with reference to figure 1 and Fig. 2, capacitance type touch-control panel 24 comprises a plurality of input end X1～Xm and a plurality of output terminal Y1～Yn.Detect the transmitter 221 generation initial voltage signal of control circuit 22 get tool specific voltage amplitude after potential transferring devices 222 is carried out the electric potential shiftings operation scanning voltage signal (it is a square-wave signal shown in Fig. 2), the scanning voltage signal scans whole capacitor formula contact panel 24 with input end X1～Xm that bilateral type of drive inputs to capacitance type touch-control panel 24.After receiver 224 receives a plurality of detection voltages from a plurality of output terminal Y1～Yn of capacitance type touch-control panel 24, deliver to charging circuit 225 and input to digitial controller 220 in regular turn after voltage amplifier 226 processing and amplifying and analog/digital converter 228 digitizings, these Digital Detecting voltages will be exported as the touch control detection result after digitial controller 220 is handled.
Fig. 3 illustrates the waveform of a plurality of detection voltages that a plurality of output terminal Y1～Yn of capacitance type touch-control panel 24 export separately.In conjunction with Fig. 2 and Fig. 3 as can be known, because capacitance type touch-control panel 24 original RC load distribution are inhomogeneous, the RC loads are big more in the middle of the past more capacitance type touch-control panel 24; Therefore the amplitude of capacitance type touch-control panel 24 middle detection voltage under not touched state is minimum (for example, 70mV), and under bilateral type of drive, the amplitude of capacitance type touch-control panel 24 Far Lefts and rightmost detection voltage the highest (for example, being respectively 380mV and 360mV).
Yet, in detection control circuit 22 shown in Figure 1, when the reference voltage of analog/digital converter 228 is that (for example, in the time of 3.3V), the detection voltage potential after amplifying through voltage amplifier 226 must all will just have way to distinguish at the following analog/digital converter 228 of 3.3V to certain value; If come the enlargement ratio of calculating voltage amplifier 226 and be no more than the reference voltage 3.3V of analog/digital converter 228 with the highest detection voltage among Fig. 3, then enlargement ratio is 8.Therefore, it is 3.04V that voltage is detected in the highest amplification back, and detecting voltage after the minimum amplification is 0.56V; The electric current that consideration human body touch capacitor type contact panel 24 is led away is limited, and the excessive situation of detection voltage difference after amplifying of each output terminal Y1 under not touched state～Yn output will be unfavorable for that analog/digital converter 228 produces the exponent number judgement of digital value.
Summary of the invention
Purpose of the present invention is providing a kind of capacitance type touch detection system exactly, improves the inhomogeneous influence that is caused of the original RC load distribution of capacitance type touch-control panel in the prior art with effective.
A further object of the present invention provides a kind of detection signal and receives and waveform-shaping module, improves the inhomogeneous influence that is caused of the original RC load distribution of capacitance type touch-control panel in the prior art with effective.
One embodiment of the invention proposes a kind of capacitance type touch detection system, comprises capacitance type touch-control panel and detects control circuit; Capacitance type touch-control panel comprises a plurality of input ends and a plurality of output terminal; Detect control circuit and comprise sweep signal transmitter module and detection signal and waveform-shaping module.The sweep signal transmitter module is electrically coupled to above-mentioned input end to provide the scanning voltage signal to these input ends, and detection signal reception and waveform-shaping module are electrically coupled to the detection signal above-mentioned output terminal produces a plurality of processing with a plurality of detection signals that receive and handle these output terminals outputs after.Wherein, detection signal reception and waveform-shaping module comprise receiver and impedance matching network; Receiver is in order to receive above-mentioned detection signal, and impedance matching network is in order to carry out the detection signal the wave shaping processing gets above-mentioned processing with the inhomogeneous influence that is caused of RC load distribution on the building-out capacitor formula contact panel after to above-mentioned detection signal.
In one embodiment of this invention, above-mentioned impedance matching network comprises a plurality of separate RC series circuits, one end of each RC series circuit is electrically coupled to preset potential (for example, earthing potential), and the other end concerns the corresponding person who receives in the above-mentioned detection signal because of electric property coupling.
In one embodiment of this invention, resistance and the value of electric capacity are relevant to the ratio of the voltage amplitude of the detection signal after the corresponding processing of capacitance type touch-control panel corresponding person's in the above-mentioned detection signal under not touched state voltage amplitude and corresponding therewith person in above-mentioned each RC series circuit.
In one embodiment of this invention, above-mentioned sweep signal transmitter module comprises transmitter and potential transferring devices, transmitter is in order to produce initial voltage signal, and potential transferring devices produces above-mentioned scanning voltage signal in order to initial voltage signal is carried out the electric potential shifting operation.
In one embodiment of this invention, above-mentioned detection control circuit further comprises: voltage amplifier, analog/digital converter and digitial controller; Sweep signal transmitter module, detection signal reception and waveform-shaping module and analog/digital converter are accepted the control of digitial controller, detection signal after the above-mentioned processing respectively in regular turn after voltage amplifier processing and amplifying and the digitizing of analog/digital converter and a plurality of digital detection signals, these digital detection signals are exported as the touch control detection result after digitial controller is handled.Further, detect control circuit and more can comprise charging circuit, it is electrically coupled between detection signal reception and waveform-shaping module and the voltage amplifier and accepts the control of digitial controller.
Yet another embodiment of the invention proposes a kind of detection signal and receives and waveform-shaping module, is applicable in order to capacitance type touch-control panel is carried out the detection control circuit that detects control operation; A plurality of output terminals that this detection signal receives and waveform-shaping module is electrically coupled to capacitance type touch-control panel produce the detection signal after a plurality of processing with a plurality of detection signals that receive and handle these output terminals outputs, it comprises: receiver and impedance matching network.Wherein, receiver is in order to receive above-mentioned detection signal; Impedance matching network is in order to above-mentioned detection signal is carried out wave shaping and handle and the detection signal after must handling, so that reach unanimity when the voltage amplitude of the detection signal of capacitance type touch-control panel after these processing under the not touched state.Further, impedance matching network can comprise a plurality of separate RC series circuits, and an end of each RC series circuit is electrically coupled to preset potential, and the other end concerns the corresponding person who receives in these detection signals because of electric property coupling.Further, resistance and the value of electric capacity are relevant to the ratio of the voltage amplitude of the detection signal after the corresponding processing of capacitance type touch-control panel corresponding person's in these detection signals under not touched state voltage amplitude and corresponding therewith person in each RC series circuit.
The embodiment of the invention comes each output terminal of capacitance type touch-control panel is carried out impedance matching by setting up impedance matching network, the purpose of carrying out wave shaping with a plurality of detection signals of reaching each output terminal output of capacitance type touch-control panel; Therefore can effectively improve the inhomogeneous influence that causes of capacitance type touch-control panel RC load distribution in the prior art, and then be beneficial to the exponent number judgement that detects analog-to-digital in the control circuit greatly.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, does not constitute limitation of the invention.In the accompanying drawings:
Fig. 1 illustrates the structured flowchart into a kind of capacitance type touch detection system in the prior art.
Fig. 2 illustrates the structural representation into the capacitance type touch-control panel in the capacitance type touch detection system shown in Figure 1.
Fig. 3 illustrates the waveform into capacitance type touch-control panel shown in Figure 2 a plurality of detection voltages of each output terminal output under not touched state.
Fig. 4 illustrates the structured flowchart for a kind of capacitance type touch detection system that is relevant to the embodiment of the invention.
Fig. 5 illustrates the concrete structure block diagram into part of module in the capacitance type touch detection system shown in Figure 4.
Drawing reference numeral:
20: capacitance type touch detection system
22: detect control circuit
220: digitial controller
221: transmitter
222: potential transferring devices
224: receiver
225: charging circuit
226: voltage amplifier
228: analog/digital converter
24: capacitance type touch-control panel
X1～Xm: input end
Y1～Yn: output terminal
10: capacitance type touch detection system
12: detect control circuit
120: digitial controller
122: the sweep signal transmitter module
124: detection signal receives and waveform-shaping module
125: charging circuit
126: voltage amplifier
128: analog/digital converter
14: capacitance type touch-control panel
1220: transmitter
1222: potential transferring devices
1240: receiver
The 1242:RC impedance matching network
R1～Rn: resistance
C1～Cn: electric capacity
Embodiment
Referring to Fig. 4, it illustrates the structured flowchart of a kind of capacitance type touch detection system that is relevant to the embodiment of the invention.As shown in Figure 4, capacitance type touch detection system 10 comprises detection control circuit 12 and capacitance type touch-control panel 14.Wherein, detect control circuit 12 and comprise that digitial controller 120, sweep signal transmitter module 122, detection signal receive and waveform-shaping module 124, charging circuit 125, voltage amplifier 126 and analog/digital converter 128; Sweep signal transmitter module 122, detection signal reception and waveform-shaping module 124, charging circuit 125 and analog/digital converter 128 are accepted the control of digitial controller 120.
Please in the lump with reference to figure 5, it illustrates the concrete structure block diagram of the part of module of capacitance type touch detection system 10.As shown in Figure 5, capacitance type touch-control panel 14 comprises a plurality of input end X1～Xm and a plurality of output terminal Y1～Yn.Sweep signal transmitter module 122 is electrically coupled to a plurality of input end X1～Xm of capacitance type touch-control panel 14 and comprises transmitter 1220 and potential transferring devices 1222, the initial voltage signal of transmitter 1220 generations sees through potential transferring devices 1222 and carries out electric potential shiftings operation back and get scanning voltage signal (it is a square-wave signal shown in Fig. 5), and the scanning voltage signal comes whole capacitor formula contact panel 14 is scanned with a plurality of input end X1～Xm that bilateral type of drive inputs to capacitance type touch-control panel 14.Detection signal receives and waveform-shaping module 124 is electrically coupled to a plurality of output terminal Y1～Yn of capacitance type touch-control panel 14 and comprises receiver 1240 and impedance matching network, for example, and RC impedance matching network 1242; Receiver 1240 receives a plurality of detection signals from a plurality of output terminal Y1～Yn of capacitance type touch-control panel 14, a plurality of detection signals of 1242 couples of a plurality of output terminal Y1 of RC impedance matching network～Yn output carry out that wave shaping is handled and the detection signal after a plurality of processing.Wherein, RC impedance matching network 1242 comprises a plurality of separate RC series circuits, and each RC series circuit comprises the capacitor C 1 one of (or C2～Cn) and the resistance R 1 (or corresponding person of R2～Rn) of mutual serial connection; One end of each RC series circuit is electrically coupled to preset potential (for example earthing potential among Fig. 5), and the other end receives the corresponding person in a plurality of detection signals of a plurality of output terminal Y1～Yn output because of electric property coupling relation.Need to prove at this, though a plurality of detection signals of a plurality of output terminal Y1 shown in Fig. 5～Yn output are to be received and exported to that RC impedance matching network 1242 carries out that wave shaping is handled and detection signal after must handling by receiver 1240, detection signal but a plurality of detection signals of a plurality of output terminal Y1～Yn output can see through earlier also that RC impedance matching network 1242 carries out that wave shaping is handled after must handling, the detection signal after receiving and export these and handle by receiver 1240 again.
Again with reference to figure 4, detection signal after a plurality of processing that detection signal receives and waveform-shaping module 124 is exported will be delivered to charging circuit 125 and see through voltage amplifier 126 processing and amplifying and analog/digital converter 128 digitizings in regular turn and get a plurality of digital detection signals, and these digital detection signals input to digitial controller 120 and will export as the touch control detection result after digitial controller 120 is handled.Wherein, detection signal receives and waveform-shaping module 124 can see through multiplexer (Multiplexer does not illustrate among the figure) and charging circuit 125 electric property coupling mutually.
Hold above-mentioned, input to bilateral type of drive at the scanning voltage signal under the situation of a plurality of input end X1～Xm of capacitance type touch-control panel 14, the compensation rule of RC impedance matching network 1242 is: the both sides of past more capacitance type touch-control panel 14, and the offset of RC load is big more; In other words, the transmission path of scanning voltage signal is short more, and the offset of RC load is just big more.More specifically, the value of resistance in each RC series circuit of RC impedance matching network 1242 and electric capacity is the ratio that is relevant to the voltage amplitude of the detection signal after the processing of the voltage amplitude of the corresponding person in a plurality of detection signals of capacitance type touch-control panel 14 a plurality of output terminal Y1～Yn output under not touched state and corresponding therewith person's correspondence.Particularly, for the voltage amplitude that makes the detection signal of capacitance type touch-control panel 14 after a plurality of processing of a plurality of detection signals through getting after the wave shaping of its output terminal Y1 under the not touched state～Yn output reaches unanimity, the corner frequency of each RC series circuit (Cut-off frequency) f then
0Satisfy condition: f
0=f/ (V
i/ V
0); Wherein, f is the frequency that inputs to the scanning voltage signal of a plurality of input end X1～Xm, V
iBe the voltage amplitude of the detection signal of the output of i output terminal among output terminal Y1～Yn under the not touched state, V
0Voltage amplitude for the detection signal after each is handled under the not touched state.Further, because f
0=1/ (2 π R
iC
i), so R
iC
i=(V
i/ V
0)/(2 π f).
Illustrate as follows: can suppose that the voltage amplitude of the detection signal of capacitance type touch-control panel 14 after each is handled under the not touched state is set to 70mV (that is V again with reference to figure 3
0=70mV), and the frequency f of scanning voltage signal is 600KHz (KHz), then the voltage amplitude for the detection signal of leftmost output terminal Y1 output is the situation of 380mV, then
Account form for the value of resistance in other the RC series circuit and electric capacity is identical therewith, so give unnecessary details no longer one by one.It should be noted that at this, the voltage amplitude of the detection signal of capacitance type touch-control panel 14 after each is handled under the not touched state be not limited to be set to be equal in a plurality of detection signals of capacitance type touch-control panel 14 each output terminal Y1～Yn output under not touched state the minimum voltage amplitude (for example, 70mV shown in Figure 3), it also can be set to be lower than the minimum voltage amplitude in a plurality of detection signals.
In the above-described embodiments, the scanning voltage signal is not limited to input to bilateral type of drive a plurality of input end X1～Xm of capacitance type touch-control panel 14, it can also monolateral type of drive inputs to a plurality of input ends of capacitance type touch-control panel, and the compensation rule of RC impedance matching network remains: the transmission path of scanning voltage signal is short more, and the offset of RC load is just big more.
In sum, the above embodiment of the present invention comes each output terminal of capacitance type touch-control panel is carried out impedance matching by setting up the RC impedance matching network, the purpose of carrying out wave shaping with a plurality of detection signals of reaching each output terminal output of capacitance type touch-control panel; Therefore can effectively improve the inhomogeneous influence that causes of capacitance type touch-control panel RC load distribution in the prior art, and then be beneficial to the exponent number judgement that detects analog-to-digital in the control circuit greatly.
In addition, anyly know this skill person and also can do suitable change the capacitance type touch detection system that the above embodiment of the present invention proposes, for example dispense charging circuit and detection signal received and waveform-shaping module directly is electrically coupled to voltage amplifier, suitably changes the circuit structure of impedance matching network, as long as its can reach predetermined impedance matching effect all can, or the like.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limiting the present invention, anyly knows this skill person, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking the claim scope person of defining.
Claims (9)
1, a kind of capacitance type touch detection system is characterized in that, described capacitance type touch detection system comprises:
One capacitance type touch-control panel comprises a plurality of input ends and a plurality of output terminal; And
One detects control circuit, comprise that an one scan signal emission module and a detection signal receive and waveform-shaping module, described sweep signal transmitter module is electrically coupled to described a plurality of input end to provide the scan voltage signal to described input end, and described detection signal reception and waveform-shaping module are electrically coupled to the detection signal described a plurality of output terminal produces a plurality of processing with a plurality of detection signals that receive and handle described output terminal output after;
Wherein, described detection signal receives and waveform-shaping module comprises a receiver and an impedance matching network, described receiver is in order to receive described a plurality of detection signal, and described impedance matching network is in order to carry out the detection signal the wave shaping processing gets described a plurality of processing to compensate the inhomogeneous influence that is caused of RC load distribution on the described capacitance type touch-control panel after to described detection signal.
2, capacitance type touch detection system as claimed in claim 1, it is characterized in that, described impedance matching network comprises a plurality of separate RC series circuits, one end of each described RC series circuit is electrically coupled to a preset potential, and the other end concerns a corresponding person who receives in described a plurality of detection signal because of electric property coupling.
3, capacitance type touch detection system as claimed in claim 2, it is characterized in that, in each described RC series circuit resistance and the value of electric capacity be relevant to described capacitance type touch-control panel described corresponding person in the described detection signal under not touched state voltage amplitude and with the corresponding described processing of described corresponding person after the ratio of voltage amplitude of detection signal.
4, capacitance type touch detection system as claimed in claim 1, it is characterized in that, described sweep signal transmitter module comprises a transmitter and a potential transferring devices, described transmitter is in order to produce an initial voltage signal, and described potential transferring devices produces described scanning voltage signal in order to described initial voltage signal is carried out the electric potential shifting operation.
5, capacitance type touch detection system as claimed in claim 1 is characterized in that, described detection control circuit further comprises: a voltage amplifier, an analog/digital converter and a digitial controller; Described sweep signal transmitter module, described detection signal reception and waveform-shaping module and described analog/digital converter are accepted the control of described digitial controller, detection signal after the described processing respectively in regular turn after described voltage amplifier processing and amplifying and described analog/digital converter digitizing and a plurality of digital detection signals, described digital detection signal is exported as the touch control detection result after described digitial controller is handled.
6, capacitance type touch detection system as claimed in claim 5, it is characterized in that, described detection control circuit further comprises: a charging circuit, it is electrically coupled between described detection signal reception and waveform-shaping module and the described voltage amplifier and accepts the control of described digitial controller.
7, a detection signal receives and waveform-shaping module, it is characterized in that, described detection signal receives and waveform-shaping module is applicable in order to a capacitance type touch-control panel is carried out the detection control circuit that detects control operation; A plurality of output terminals that described detection signal receives and waveform-shaping module is electrically coupled to described capacitance type touch-control panel produce the detection signal after a plurality of processing with a plurality of detection signals that receive and handle described output terminal output; Described detection signal receives and waveform-shaping module comprises:
One receiver is in order to receive described detection signal; And
One impedance matching network, in order to described detection signal is carried out wave shaping is handled and the detection signal after the described processing so that reach unanimity when the voltage amplitude of the detection signal of described capacitance type touch-control panel after described processing under the not touched state.
8, detection signal as claimed in claim 7 receives and waveform-shaping module, it is characterized in that, described impedance matching network comprises a plurality of separate RC series circuits, one end of each described RC series circuit is electrically coupled to a preset potential, and the other end concerns a corresponding person who receives in the described detection signal because of electric property coupling.
9, detection signal as claimed in claim 7 receives and waveform-shaping module, it is characterized in that, in each described RC series circuit resistance and the value of electric capacity be relevant to described capacitance type touch-control panel described corresponding person in the described detection signal under not touched state voltage amplitude and with the corresponding described processing of described corresponding person after the ratio of voltage amplitude of detection signal.
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| CN2009101799330A CN101661359B (en) | 2009-10-10 | 2009-10-10 | Capacitance type touch detection system and detection signal-receiving and waveform-shaping module thereof |
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| CN2009101799330A CN101661359B (en) | 2009-10-10 | 2009-10-10 | Capacitance type touch detection system and detection signal-receiving and waveform-shaping module thereof |
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| CN102121956A (en) * | 2010-11-26 | 2011-07-13 | 苏州佳世达电通有限公司 | Detection method and system of capacitance-type touch screen |
| CN102243554A (en) * | 2010-05-14 | 2011-11-16 | 瑞鼎科技股份有限公司 | Control method and control circuit for determining touch detection mode of touch panel |
| CN102866798A (en) * | 2011-06-09 | 2013-01-09 | 马克西姆综合产品公司 | Inter-symbol interfence reduction for touch panel systems |
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| EP1587226B1 (en) * | 2003-12-05 | 2007-10-24 | Nippon Telegraph and Telephone Corporation | Reactance adjustment device, transceiver and transmission device using the same, signal processing circuit suitable for them, reactance adjustment method, transmission method, and reception method |
| CN100368975C (en) * | 2004-12-31 | 2008-02-13 | 义隆电子股份有限公司 | Capacitance type touch panel and detection method thereof |
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| WO2019033809A1 (en) * | 2017-08-15 | 2019-02-21 | Boe Technology Group Co., Ltd. | Touch detection apparatus, touch control apparatus, touch and display driver integration chip, touch control display apparatus, and touch detection and resistance measurement method |
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